Understanding ink types, neutral density, and trapping sequence

- [Voiceover] Trapping is the process of creating…thin-colored borders where objects overlap.…If those objects don't share a common ink color.…I t's necessary to compensate for slight misregister…on press when the job is printed.…if a joining objects share a common color,…then it's usually not necessary to…create a trap where they intersect.…And trapping isn't usually needed if a job is…going to print on a digital press, now why is that?…The reasons are basically mechanical.…On a digital press, such as the Xerox iGen or HP Indigo,…all of the colors are actually transferred…to the paper stock in one pass.…

So register is, inherently, just a little bit…tighter than on an off-set press,…which applies ink to paper one ink at a time.…Let's take a look at an example job.…Here's the original art.…On the right, the blue dog is nothing but 100% cian.…The yellow dog, 100% yellow.…The magenta cat it's just 100% magenta.…The green cat is 100 cian and 100 yellow.…So, what happens if things are…a bit out of register on press?…